Note: There is a commemoration of St. Thomas a Becket, Bishop and Martyr.

Another note: All the common tones (e.g. the Benedicamus Domino) are as for a II class feast. This is because, as far as I can tell, since an octave is basically the extension of the feast, the festal tones are used; and then since the rank of the day is II class, it is obvious that the II class tones are the right ones.

Interestingly, this means that the Benedictus is sung to the simple tone; whereas on Christmas Day, the solemn tone could be used (and we did use it).